add beep to keyless

Hello,

2012 Mustang with factory keyless entry. Lights flash but no sound on lock/unlock. Would like to add some audible beep sound to the lock function and was told I need to connect a relay to the door lock wire. This would enable the lock button to both flash the parking lights as usual and also add a short quiet beep from a piezo siren that I plan to install.

Can anyone advice on what type of relay I need to purchase and what the exact connections would be? The purpose of the relay is so that when the car is on, pressing the lock on the remote fob will not send a beep to the piezo.

thank you.

Most ford systems beep on the second press of the remote I believe this feature can be turned off. Did you check you're owners manual to see of its listed ?If i Can't Install it    I Don't need it   Joe

Yes you are correct. 2nd press of lock button send a short beep to the car horn. What I'm looking to do is connect a small, relatively quiet piezo siren under the hood that beeps when lock button is pressed once confirming that vehicle is locked.

I think this can be done by hooking positive lead of piezo to the "lock motor" wire (whichever one that is). Problem is that I start car and start to drive off, vehicle has auto lock feature about 15mph automatically locks doors. So that sends a beep to the siren too. don't want that. I was told that by hooking up a relay someone, the "beep" function could be disabled when the vehicle was on, and only energized when the vehicle was off....just need the correct connections and what type of relay to purchase.

thanks.

you could do it off the lock motor wire. I belive the siren only draws ma of current. The lock motor wire should be a gray/brown wire in the DKP. Use a 5 pin relay to interupt the siren wire when the key is turned on. 85 to gnd 86 to switched 12v 87A to one side of your siren wire 30 to the other side of siren wire wired this way the relay contacts will be closed when the car is off and opened when the car is onIf i Can't Install it    I Don't need it   Joe

This:- interrupting_sounder.bmp

ok thanks for all the help...now where does the vehicle lock motor wire (gray/brown) get connected to on the relay?

http://www.kptechnologies.com/products.php#/9 Maybe something like this, already in a neat package?M.E.C.P & First-Class

Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

Ok. think I figured it out with some research on my own but maybe someone can confirm...

85 to gnd

86 to switched 12v 87A to door lock motor wire on vehicle87 (not connected)30 to the positive side of siren wire

ground the negative side of siren to chassis

No no no no. 85 to ground. 86 to lock motor wire (It's in the body control module). 87 to 5amp constant 12v+. 30 to siren pos. 87a not used. The other diagram I showed you is for ignition interrupt.

By the way, if you used a switched (ignition, ACC) supply the siren would ONLY sound with the ignition on,and then by connecting 87a all the time the ignition was on. Could I suggest you follow Tommy's good advice? You don't really seem up for this. Chevy we were both right.